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This content comes from Closed Captioning that was broadcast along with this program.

>>>new information about the disappearance of an american spy in iran. our national investigative correspondent
michael isikoff
has been dig into the story for us. good morning.

>> reporter: good morning. nbc news is learning new details about the
robert levinson
the former fbi agent who ran and disappeared several years ago while working with the
cia
. an american wanted for murder has just resurfaced, sending a surprising e-mail. when
robert levinson
flew to iran in
2007
, the associates say he was on a secret mission for the
cia
. looking into allegations of corruption involving one of the country's most powerful figures, former president but the rogue operation hatched by
cia
analysts without the approval of agencies higher up's was risky at start says the
levinson
family lawyer.

>>it was dangerous as hell. e-mails where bob conveys his fears.

>> reporter: officials tell nbc news that
levinson
vanished after meeting with this man, hudene seen here. he's an american who is wanted in maryland for the
1980
murder of an iranian compile. he led for tehran. this week, salahuddin told via e-mail the following.
white house press secretaryjay carney
says the
u.s. government
is doing everything it can to press the iranians to what happened to
levinson
.

>>this is something that we continue to raise at the highest levels.

>> reporter: but the iranians deny any knowledge of
levinson
's whereabouts and his family have heard nothing since video and photos were sent three years ago showing him gaunt and dress inside an orange jumpsuit pleading for help.

>>i am not in -- i am running very quickly. i am out of diabetes medicine.

>>i don't know what to believe, but i know there is a wife and seven children that are desperate to have their father back.

>> reporter: the fbi has posted $1 million reward for any information about
levinson
and in recent months, even took out ads in
newspapers in the united states
and so far the u.s. tell us no solid leads have turned up.